A Hearing aid provides 100 dB output with 60 dB input. If the knee point is set to 60 dB SPL and compression ratio is set to 2:1, the output of the hearing aid for a 70 dB input will be
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microphone opening of a hearing aid. Input level is expressed in dBSPL. ... set below 50 dBSPL, may be used to improve ... 2 dB change in input results in a 1 dB change.
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